Arrangement for controlling the driving motors in high-frequency machines



Nov. 24, 1925. 1,563,140

G. G. VON ARco ARRANGEMENT FOR CONTROLLING THE muvme mowoas IN HIGH FREQUENCY mcnnms Filed Aug. 5, 1922 TUNED THERMONIC CONTROLLING cmcuns RECTIFIERS RELAYS 2 10 6 LARGE VARIATION 7 6MRLL veRmnoN 8 SMALL vnamnon 9 LHRGE vama-nou MOTOR 5mm CONTROL GENERHTOR um/atom GRRF GEURG VUN QRCU Patented Nov. 24, 1925 UNITED STATES Gm GIORG- VON #360, O! BERLIN, GERMANY, ASSIGNOB 'I'O' GESELLBOEAIT FUR DMH'ILOSE TELIGRAPEIE .I. B. 3., OF BERLIN, GERMANY, A CORPORATION.

anaauonum son cou'rnonnmo THE nnIvIuo morons uacnmns.

in men-resonance Application filed August 8, 1822. Serial No. 578,502.

To all whom it may concern:

arises that these large stages are continuous- 65 Be it known that I, Gm Gnono' voiw ARCO,\ly switched in and out when the machine a citizen of the Republic of Germany, and a resident of Hallesches Ufer 12/13, Berlin, S. W. 11, Germany, have invented new and useful Improvements in Arrangements for- Controlling the Driving Motors in Hi h-' Frequency Machines (for whiclh I have fi ed an a lication in Germany Aug. 2, 1921 of w ch the following is a specification accompanied by drawings. The necessity of providing means for controlling the rotation of high frequency machines is well known. In order fully to utilize the modern, widerange, selecting means provided in the receiver, it is necessary to have an exceptionallyconstant .frequency.

Generally speaking, the principle of controllingthe rotation of the driving motors 'of high frequency machines consists in using the normal circuit, e. g., in the form of an oscillating circuit which contains only constant values sudlfi as, for example, C, L

and W and which'is brought into function in case of an increase in the frequency of the machine caused by variations 1n the rotation. If in addition to th1s,'such a 881151 tive means as for example, the so called phase leap 1s used together with cathode tubes as rectifier and amplifier in order to obtain in res nse to the s i htest phase displacement direct current 0 varym direc- I tion and strength, a very sensitive in icating ap aratus is obtained. Notwithstanding this a further difliculty is encountered in connecting the very sensitive indicating arra ment with the driving motor as an operative re lator. A polarized relay wihich is actuate by the varying direct currenthas been used in the past for actuating high potential current switches for the purpose 0 controlling the'driving motor m such a manner that its speed of rotation remains the same even in case there are variations in the current supply. llhis is possible as long as the variations in the current-supply remain within certain limits. However, if these variations exceed certain predetermined limits, the correcting stages will no longer suflice for speeding up and slowing down the motor, and-if they are made 'gre enough to be sufiicient, then the difliculty f fiers 10, 11, 12, and 13 are controlling relays atf varies from its normal speed of rotation. The correcting of the switches is too strong, and on account of this the switches must be made to stand strotng currents .and will so vtherefore be very heavy. Due to this they will have a considerable time constant and operate sluggishly. This has been remedied by connecting in parallel with the control produce the desired change in the speed of 7 rotation ofth'e motor for a period longer than that of the time relay. By means of this time relay a larger resistance value is connected in and out of the circuit.

However, this arrangement hasthe disadvantage that it takes too lon a time to make the large corrections whicfi correspond to stron fluctuations in the current supply and durl this time the speed of rotation of the mac ine is left uncorrected.

The purpose of the present invention is to provide a regulation wh ch operates with greater speed, i. e., a cascade regulation.

The single figure of the drawing represents schematically the arrangement of the apparatus accordingjto my invention.

Referring to the drawing a radio frequenc generator is shown suitably coupled to a riving motor. Coupled to an output circuit '1 of the generator are tuned circuits. 2, 3, 4 and 5, each circuit being tuned to a different frequency which differs from the normal fre uency at which it is desired the generator s all run. Connected to tuned circuits 2, 3, 4 and 5 thru thermionic-recti- 6, 7, 8 and 9.

Assuming that the frequency at which it is desired to maintain the generator is equal to f then tuned circuit 3 is tuned to frequency f+A, where A is a relativel small amount and the circuit 2, is tune to frequency f+A+B, where B may be larger than A. Similarly circuit 4 is tuned to frequency f-ia]1;d'circuit 5 is tuned to frequency When the speed of the generatorcorrecorresponding to the particular tuned c1rcuit. These relays control, in any suitable manner, the speed of the drlvmg motor.

Relay 7, when operated, effects the motor,

speed control to tend to slow down the motor to a relatively small extent. Relay 6, when operated, effects the motor speed control to tend to slow down the motor to a relatively greater extent. Similarly, when relay 8 is operated, the motor speed tends to increase to a relatively small extent and when relay 9 is operated, the motor speed tends to increase to a relatively greater extent.

The operation of my invention is as follows: Assume that the generator is running at desired frequency when, due to some cause, as a change in t e generator load or a change in the voltage supplying the drivin motor, the frequency increases a smal amount equal to A. Tuned circuit 3 which is tuned to the increased frequency will then supply sufiicient current to operate relay 7 Relay 7 will immediately operate on the motor speed control to tend to force the motor speed to decrease by a small amount.

In other words the change in the motor speed control mechanism will be a small one.

If the cause which compelled the frequency to increase was of small effect, no further operation of relays will result, but when the cause is removed, the relay 7 will be released and the motor control will go back to normal condition. But, if the disturbin cause is a sufficiently large one, then the ad ustment of the motor control caused by operation of relay 7 is not suificient to bring back the frequency to normal and the frequency will continue to increase till it reaches a value equal to f+A+-B.

WVhen the generator reaches the frequency f-l-A-f-B, tuned circuit 2, which is tuned to this new frequency, -will supply suflicient current to operate controlling relay 6. Relay 6 immediately operates on the motor speed control in such a way asto slow down the motor sufficiently to bring it back to normal speed. In other words, the change in the motor control mechanism will be a rela-- tively large one.

Similarly if the frequency decreases from normal due to any cause, the tuned circuits 4 and 5, rectifiers 12 and 13 and controlling relays 8 and 9 will be brought into play to speed up the motor, the tuned circult 4 responding to a relatively small decrease in speed and the relay 8 causing a correspondfi ing relativel small change in the -motor speed contro and the tuned circuit. 5 respondmg to a relatively larger decrease in speed and causing a relatively larger change in the motor speed control. i

It will be appreciated that the detuning of circuits 2, 3, 4 and 5 from the normal frequency and the sensitivity of relays 6, 7, 8

and 9 may be so adjusted that small variation relays 7 and 8 will continue to be o'perated even though relays 6 and 9' have also been operated.

It will be seen that the small variation relays 7 and 8 which switch in and out comparatively small amounts of energy will be operated comparatively frequently to keep the desired normal frequency; whereas, the large variation relays 6 and 9, which switch .in and out comparatively large amounts of energy will be operated comparatively infrequent but when the need for their operation arises, immediately.

Having describ (1 my invention, what I claim is:

' 1. An arrangement for controlling the driving motor of a high frequency machine comprising independent tuned circuits coupled to the output'circuit of the high fro-- quency machine, one tuned circuit being.

tuned to a frequency differing from the normal frequency b a relatively small amount, another tuned circuit being tuned to a he quency differing from the normal frequency by a relatively arge amount, aparatus controlled b said first mentione tuned circuit for 5 anging the motor'sp'eed by a relatively small amount towards normaland apparatus controlled by said second mentioned tuned circuit for changing the motor speed by a larger amount towards normal.

2. An arrangement for controlling the driving motor of a high frequency machine comprising independent tuned circuits coupled to the output circuit of the high frequency machine, certain of which are tuned to frequencies differing from the normal frequency by relatively small amounts and another of which is tuned to a frequency differing from the normal frequency by a relatively large amount, relays, each of which is connected to a tuned circuit, rectifiers, each of which is interposed between a tuned, circuit and its connected relay, a motorspeed control, said motor-speed control being regulated by said relays so as to effect a fine variation in motor-speed when one of the relays controlled by the first mentioned tuned circuits operates, and to correct a relatively large variation in motor speed when the relay connected to the last mentioned tuned circuit operates.

3. An arrangement for controlling the driving motor of a high frequency machine comprlslng means immedlately responsive to a relatively small frequency change for tively large frequency change only, for

4. An arrangement for controlling the.

driving motors in high frequency machines comprising a transmission conductor, circuits coupled to the transmission conductor, said circuits including a plurality of circuits tuned to frequencies less than the frequency which it is desired to transmit from said conductor and also including a plurality of circuits tuned to frequencies greater than that which it is desired to transmit from said conductor and certain of said pluralities of circuits being detuned with respect to the desired frequency to a less extent than an other of saidcircuits, means controlled by the circuits which are detuned to the least extent from the desired frequency for effecting fine regulation of the speed of the motor and means controlled by the circuits which are detuned to the largest extent from the desired frequency for effecting coarse regulation of the speed of the motor.

.5. An arrangement for controlling the driving motor of a high frequency machine comprising independent tuned circuits coupled to the output circuit of said high frequency machine, one tuned circuit being tuned to a frequency diflering from the nor- I mal frequency of said machine by a relatively small amount and another tuned circuit being tuned to a frequency differing from the normal frequency of said machine by a larger amount, separate relays controlled by said circuits and apparatus independent- 1y controlled by said relays for changing the motor speed to different degrees corresponding to the deviation of the speed from normal. I,

GRAF GEORG v. ARGO. 

